From Li Yaxuan’s 35 Points on Push Hands Training, Translation by Scott Meredith.
Li Yaxuan is said to be Yang Cheng Fu's very best student.
You have to achieve relaxation, but without forcing it. When you practice, think of relaxation, the concept or even the word, with your whole heart and mind. With consistent high-quality practice of a long period, you’ll begin to achieve real relaxation. And only then can you issue energy as described above. If you practice with adherence to the concept of “balancing hard and soft”, you’ll never get anywhere near the real state of relaxation, even if you practice your entire
life. So just keep working on relaxation alone in your daily practice, keep thinking only of that. Holding the idea of “balancing hard and soft” will guarantee that you'll never realize the power of true relaxation.
The quote sums up my thoughts very well. To understand how to use tai chi principles you can not rely on structure, technique or "Holding the idea of 'balancing hard and soft'". What Li does is obviously pointing at Chen Style. Couldn't agree more.